A 39-year-old man has experienced chronic fatigue and weight loss for the past 3 months. There are no remarkable findings on physical examination. Laboratory studies show hemoglobin, 10.0 g/dL; hematocrit, 30.3%; MCV, 91 mm3; platelet count, 240,000/ mm3; WBC count, 7550/ mm3; serum iron 80 mg/dL; total iron-binding capacity, 145 mg/dL; and serum ferritin, 565 ng/mL. Serum erythropoietin levels are low for the level of Hb and hepcidin levels are elevated. Which of the following is the most likely diagnosis?